How JustAnswer Works:

  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site.
    Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.

Ask Richard Your Own Question

Richard
Richard, Technical Manager
Category: HVAC
Satisfied Customers: 1514
Experience:  27 years of Experience, NATE Certified, professional trainer
29828770
Type Your HVAC Question Here...
Richard is online now
A new question is answered every 9 seconds

I have installed a new Rheem Heat Pump system which includes:

Customer Question

I have installed a new Rheem Heat Pump system which includes: a Rheem air handler, heat pump, and a electronic air cleaner. The model numbers are:
-13PJL36A01/RHSLHM3617JA - 3 Ton 13 SEER R410a Refrigerant Rheem
- Heat Pump Air Conditioner Split System
- [RXBH Heat Strips:RXBH1724A10J - 10kw (34,100 BTU)]

The system cools very well.
The system will heat when set to emergency heat using the backup electric heater.
The heat pump shutsdown after 1 minute, 30 seconds of operation while in Heat mode.

Here is my debugging of the system:

1. Thermostat is set for heat and 90deg. F.
2. System starts
3. Lo Pressure reads 238 /80deg. F, Hi Pressure 240psi/81deg. F after settling out.
4. Interior Temperature: 73 deg. F.
5. Exterior Temperature: 87 deg. F.
6. Compressor runs for 1:36 minutes. During that time, there is a rattling sound in the outdoor unit. Compressor emits slightly warm air. AH is air temperature neutral, suction line is warm.
7. Shutdown.
8. AH is still running.
9. LED2=blinking, LED1=OFF.
10. 5 minutes Timeout.
11. Go to 1.

Any help would be greatly appreciated.
Submitted: 2 years ago.
Category: HVAC
Expert:  hvacdave84 replied 2 years ago.

hvacdave84 :

Hi, I'm Dave. I'd be glad to try and help shed some light on the situation

hvacdave84 :

Rheem service manuals are hard to come by, I can tell you that one scenario you could have, is too high of an ambient temp. the condensing unit becomes the evaporator in heat mode, which means that the ambient temp is driving your suction pressure WAY too high (as evidenced by the nearly identical suction and discharge pressures you've listed) it cold be that the compressor is trying to create a viable compression ratio, working too hard and tripping on the internal overload or some other safety. Another situation you could be getting here is a failed/malfunctioning reversing valve, or check valve. the valve that re-directs refrigerant flow in heat mode is the reversing valve. the valves that keep the refrigerant from flowing the wrong direction are check valves. if any of these are malfunctioning, it would cause the head that the compressor is creating, to be pushed into both sides of the system. which would also give you identical pressures. one suggestion would be to lightly spray the condensing unit's coil with water while it is running. if the suction drops to about one third of the head (or thereabouts) it's likely that the ambient temp is too high to be running the unit in heat mode. if both the head and suction drop, and remain pretty much the same as each other, you likely have a failing/failed valve, and will need further troubleshooting.

Customer:

Hi Dave,

Customer:

Thanks for your analysis of the situation. I figured that the problem was probably in the reversing valve. Also, given that the unit shutsdown after 1-1/2 minutes makes me think that a sensor/check valve is kicking in. I will execute the test you recommended to determine if the ambient air is too high and report back to you. Is there any way to further test the reversing valve or to find out what check valves/sensors may exist in this unit?

Customer:

Regards,

Customer:

Omar

Expert:  Richard replied 2 years ago.

Hello , let me see if I can guide you here. First is the cause is th eoutdoor temperature thi sunit has a hi presure switch and th eboard will flash a code. Since yo ulisted Led 1 is off and Led 2 is on thi smeans you tripped on a low pressure lock out. It will auto reset three times then tuwning the power on and off or touching the test pins will reset.

Low pressur elock out typicall mean low charge so you may have a leak. The only way to know here is to put a set of guages on it. Now since it seemed to work in Cool mode you may also have a failed TXV on the outdoor unit. In the cool mode it is bypassed with an internal check valve in the heat mode it is metered. Again a set of guages will tel us what the system pressures are.

TXV can fail for many reason from a bad power head to poor installation. If an old line set was used and not flushed correclty or lack of a drier filter , or not running nitrogen through the lines during the brazing process can all be causes.

Let me know if I can be of more help thank you Richard

Expert:  Richard replied 2 years ago.

Hello also if you need a manual let me know I will send you a link.

Thank you Richard

Customer: replied 2 years ago.
Hi Richard,

Thanks for responding to my question.
Let me see if I can provide more information.
The unit works great in cool mode. No complaints.
I would assume that if it works in cool mode that the unit is properly charged. If I'm wrong, please let me know.
There does appear to be some kind of sensor that is causing the "shutdown" of the unit while in heat mode. As I mentioned, shutdown occurs after 1 min, 36 seconds of operation. I do think, now that you mention it, that there is a 5min shutdown after three attempts. I think I read that in the user's manual.
The questions I have are:
1. can you tell me what and where are the sensors in the heat pump for heat mode?
2. is there a test that I can do to check that the sensors or check valves are operating correctly?
3. how do I tell if the reversing valve or txv in the heat pump are operating correctly?
4. Yes, please send me a link to the service manual for this unit.
Thanks,
Omar.
Customer: replied 2 years ago.
,P.S. Richard, my first email has the pressures that I recorded while in heat mode. Also, the line set was flushed with R-11 and N2 was used for the braising.
Customer: replied 2 years ago.
Richard, did you get my emails ?
Expert:  Richard replied 2 years ago.

Hello sorry there was a long delay in the message.

Let me see if I can answer all your questions. First even though you cool ok you can have a system issue. An over charged system will work fine in cool however one it is switched to heat refrigerant has to be taken out of the system by a charge compensator . On this model it will look like a big black can. If it is over charged the compensator can not remove enough so the head pressure goes up and trips the sensor. You have hi and low pressure sensor on this model.

To correct this issue it is simple first someone needs to check, measure and set the air flow to be close to 400 CFM per ton of cooling. You have 3 ton so 1200 CFM once the do this set to cool , they take the system running pressure convert them to saturation temps and subtract the temps of the lines. This gives them Super Heat and Sub cooling. Super Heat should be between 10 and 15 Sub cooling 10 degrees.on this unit. Then switch to heat mode. to check. The system should run fine with outdoor temp 80 and indoor temp 80 if it is hotter than that you will have to wait for a good test since the head pressure will naturally be hi at those temps.

The reversing valve on Rheem and Ruud is energized in heat mode. So ( it is not easy to access on the 13PJ series but there is a blue wire that comes from the thermostat un hook it while in the heat mode and it will shift to cool you will hear it to know it is shifting. Or if someone can access the valve get a couple of small earth magnets ( radio shack) place them on the brass body unit the stick then when the valve shifts you will see them move. ( there is probably a video in you tube somewhere lol ) .

To check the sensor look for them they small with two wires ( probably yellow and brown) pull one of the wires off where is goes to the board and the unit will shut down proving the switch will open.

Let me know if you need more. Ill look for your response.

Thank you Richard

Customer: replied 2 years ago.
Richard,
I'm checking out the heat pump per your description in the last email.
Could you send me a link to the service manual as well?
I'll send the data over to you as soon as I finish the tests.
Omar.
Customer: replied 2 years ago.

Richard,


Can you send me the service manual you referenced in your email.


Regards,


Omar.

Expert:  Richard replied 2 years ago.
Hello yes give me a few moments to download. I will try to send you alink if that doea not work Ill post it on a hosting site for you. Thank you
Expert:  Richard replied 2 years ago.

http://www.mediafire.com/view/?hhzxuq7c492njaw

http://www.mediafire.com/view/?nt59fhaqw9jdkse

Let me know if these links work if not I can try a differant way thank you Richard

Customer: replied 2 years ago.

Richard,


These look similar to the installation manuals that came with the AH and Heat Pump, though I think these might be more detailed. I hope so.


It rained all weekend so I was not able to troubleshoot the system.


I will get back to you this week with what I discover.


thanks for the help.


Omar.

Expert:  Richard replied 2 years ago.

Hello Omar

These are all they offer in the way of technical documents. They stopped making service manuals a few years ago. Once the unit has a code ( flash code) then you can use that as a guide to troubleshoot the system. Pay close attention to the flash code and remember it is a guide not a diagnostic tool. Example if the Low pressure switch tripped you may have a dirty filter, low charge, low airflow or stopped fan. It does not mean the low pressure switch has failed. However, parts chage on some ofthe older models they used a 50 PSI low pressure switch this had a common issue of tripping for no real reason so they switched to a 15 PSI pressure switch. First steps to make sure the system was set up correctly Air Flow number 1 , 400 CFM per ton of cooling if this is wrong all measurement will be wrong. Then super heat and sub cooling for this you need system pressures and line temps. Then we can see how the system is doing.

JustAnswer in the News:

 
 
 
Ask-a-doc Web sites: If you've got a quick question, you can try to get an answer from sites that say they have various specialists on hand to give quick answers... Justanswer.com.
JustAnswer.com...has seen a spike since October in legal questions from readers about layoffs, unemployment and severance.
Web sites like justanswer.com/legal
...leave nothing to chance.
Traffic on JustAnswer rose 14 percent...and had nearly 400,000 page views in 30 days...inquiries related to stress, high blood pressure, drinking and heart pain jumped 33 percent.
Tory Johnson, GMA Workplace Contributor, discusses work-from-home jobs, such as JustAnswer in which verified Experts answer people’s questions.
I will tell you that...the things you have to go through to be an Expert are quite rigorous.
 
 
 

What Customers are Saying:

 
 
 
  • You did one super job of explaining to me everything there is to know about this fridge. I'm looking forward to asking you questions in the future. Jimmy Bagley, IA
< Last | Next >
  • You did one super job of explaining to me everything there is to know about this fridge. I'm looking forward to asking you questions in the future. Jimmy Bagley, IA
  • Wonderful service, prompt, efficient, and accurate. Couldn't have asked for more. I cannot thank you enough for your help. Mary C. Freshfield, Liverpool, UK
  • This expert is wonderful. They truly know what they are talking about, and they actually care about you. They really helped put my nerves at ease. Thank you so much!!!! Alex Los Angeles, CA
  • Thank you for all your help. It is nice to know that this service is here for people like myself, who need answers fast and are not sure who to consult. GP Hesperia, CA
  • I couldn't be more satisfied! This is the site I will always come to when I need a second opinion. Justin Kernersville, NC
  • Just let me say that this encounter has been entirely professional and most helpful. I liked that I could ask additional questions and get answered in a very short turn around. Esther Woodstock, NY
  • Thank you so much for taking your time and knowledge to support my concerns. Not only did you answer my questions, you even took it a step further with replying with more pertinent information I needed to know. Robin Elkton, Maryland
 
 
 

Meet The Experts:

 
 
 
  • gotoman for ac

    HVAC Technician

    Satisfied Customers:

    4657
    51 years of experience install design and repair of all makes and models of AC
< Last | Next >
  • http://ww2.justanswer.com/uploads/SE/ServiceTechRus/2012-6-7_2119_056.64x64.JPG gotoman for ac's Avatar

    gotoman for ac

    HVAC Technician

    Satisfied Customers:

    4657
    51 years of experience install design and repair of all makes and models of AC
  • http://ww2.justanswer.com/uploads/AL/alumalite/2012-5-10_234018_shutterstock506249951forJA500.64x64.jpg Phil's Avatar

    Phil

    Mechanical Engineer

    Satisfied Customers:

    3888
    Retired HVAC/ Electrical & Boiler contractor. Industrial
  • http://ww2.justanswer.com/uploads/skibum0101/2008-12-16_015819_just_answer.jpg Rick Mather's Avatar

    Rick Mather

    HVAC Technician

    Satisfied Customers:

    3132
    35 years experience, HVAC
  • http://ww2.justanswer.com/uploads/RY/Rygis20/2011-5-7_3143_DSC5324.64x64.JPG Matthew's Avatar

    Matthew

    HVAC Technician

    Satisfied Customers:

    1994
    14 years experience in the HVAC field of service, installation, Manual J & D calculations
  • http://ww2.justanswer.com/uploads/KE/kentguidry/2011-9-26_214316_0059.64x64.jpg Kenton Guidry's Avatar

    Kenton Guidry

    HVAC Technician

    Satisfied Customers:

    962
    12 years install/service experience.
  • http://ww2.justanswer.com/uploads/solarman1947/2009-12-13_223915_phpkKBcXq_c2PM.jpg Rick Ridley's Avatar

    Rick Ridley

    UK Heating Engineer

    Satisfied Customers:

    871
    Retired But have had 30 years on the tools, Ex CORGI
  • http://ww2.justanswer.com/uploads/Ironheadfan/2009-12-18_222416_pump_005.jpg Tom's Avatar

    Tom

    HVAC Technician

    Satisfied Customers:

    770
    16+yrs HVAC/R service. Residential Commerical Industrial
 
 
 

Related HVAC Questions

Chat Now With A HVAC Technician
Richard
Richard
HVAC Technician
1514 Satisfied Customers
27 years of Experience, NATE Certified, professional trainer